Heat capacities and thermodynamic functions of new cobalt manganites LaMII2CoMnO6 (MII-Mg, Ca, Sr, Ba) in the 298.15–673 K temperature range

Bulat Kunurovich Kasenov, М. О. Туртубаева, Амерханова Шамшия Кенжегазиновна, Zhenisgul Imangalievna Sagintaeva, Е. Е. Куанышбеков, А. А. Сейсенова, Д. И. Смагулова

2015

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DOI 10.1134/s0036024415050180

Data confidence 70 medium

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Abstract

Temperature dependences of the heat capacities of cobalt manganites LaM 2 II CoMnO6 (MII = Mg, Ca, Sr, Ba) are investigated by means of dynamic calorimetry in the temperature range of 298.15–673 K. It is established that cobalt manganites display λ-like effects on the C po ∼ f(T) curve, which are likely to be related to the type II phase transitions. Equations for the temperature dependence of the heat capacity of cobalt manganites are derived from the experimental data with allowance for phase transition temperatures. The values of C po (T) and thermodynamic functions H po(T) − H po(298.15), S po(T), and Φxx(T) are calculated.